mcarthur



P. MCARTHUR.

RYING APPAR Patente d Aug. 19,1890.

(No Model.) l 2 Sheets-sheet 2.

P. MGARTHUR. MOLD DRYING APPARATUS.

No. 434,833. A Patented Aug. 19, 1890.

ma :mams uns on., maxaman., msnmnran, nc.

UNITED STATES PATENT OFFICE.

PETER MCARTHUR, OF ST. LOUIS, MISSOURI, ASSIGNOR OF TVVO-THIRDS TOTHOMAS HOWARD AND JOHN NV. HARRISON, BOTH OF SAME PLACE.

MOLD-.DRYING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 434,833, dated August19, 1890.

Application filed November 4, 1889. Serial No. 329,159. (No model.)

To all whom it may concern: the molds of course not yet having beendried Be it known that I, PETER MCARTHUR, of and hardened, the resultbeing that a faulty' the city of St. Louis, in the State of Missouri,pipe will be produced. By a long practical have invented a certain-newand useful Appaexperience these difficulties have proven them- 5 5 5ratus for Drying Molds in the Manufacture selves to be of very seriousimportance in the of Cast-Iron Pipes, of which the following ismanufact-ure of cast-iron pipes in this wella full, clear, and exactdescription, reference known method. I seek to and do overcome being hadto the accompanying drawings, these difficulties by a method of dryingthe forming part of this specification. flasks without removing themfrom their sup- 6o xo My invention relates to an improved appaports,thus avoiding theexpense of handling' ratus for drying molds in themanufacture or them and the accidents incidentthereto. It production of.gas-pipes, water-pipes, and the has heretofore been proposed to dry themolds like; and my invention consistsin features of without removing theflasks from their supnoveltyhereinafterfully described,and pointports;but so far as I am aware all efforts 65 15 ed out in the claims.heretofore have proved to be failures.

Figure I is a top or plan view of a pit, Referring to the drawings, 1represents a showing a number of flasks locat-ed therein pit which Ihave shown circular in form, but and illustrative of my invention. Fig.II is which may of course be of any desired shape.

a vertical section taken on line II II, Fig. I. This pit is formed by anouter wall 2 and an 7c' zo Fig. III is an enlarged view of one of thenozinner wall 3.

zles of the conducting-tubes, and Fig. IV is 4 represents the flasks,located in the pit an enlarged detail section of the :nozzles and andsupported from the walls by any suitable conducting-tubes and throughone of the ues method. or ducts into which the nozzle discharges.Mypresent invention does not relate to the 75 2 5 It has long been thepractice in the manumanner of supporting the iiasks.

facture of cast-iron pipes to remove the flasks I have shown two rows orseries of flasks, to a drying-oven after the molds have been one row orseries being supported at the formed and the patterns removed. It hasouter wall 2 and the other row or series bealso been common to reserve aportion of the ing supported at the inner Wall 3. During 8o 3o pit-as,for instance, the portion indicated the drying process the pit isdesigned to be between the letters A B, Fig. I-for such purcovered attopby means of a sectional hood pose, and the flasks are moved from their5, which covers the asks, and which is of supports to this oven by meansof a suitable course removed during the ramming process crane. and whenthe patterns are being inserted 85 3 5 It will be understood, of course,that after and taken out, and While the cores are being the molds havebeenformed by ramming sand inserted, the cores and patterns being hanina space between the patterns and the indled in any suitable Way-as, forinstance, side walls of the flasks these molds thus by means of a cranesupported in the cen-A formed have to be dried, and, as stated, it tralchamber 6 within the wall 3. After the 9o 4o has been the practice tomove the flasks after ramming is done and the patterns removed thepatterns are Withdrawn to an oven for the molds are ready to be dried,and the hood this purpose. There are many objections 5 is placed overthe pit l and asks 4, and to this method, among which may be menremainsthere during the drying process, as tioned the cost of moving theseheavy flasks stated. 95 45 and the accidents incident thereto, largely 7represents gas-pipes, whichl have shown resulting from the fact that itis practically as radiating from a circular pipe 8, which is impossibleto swing these flasks and set them supplied with gas from the main pipe9. down in the oven without their coming against 10 represents combinedair and steam each other or against the Walls of the pit. pipescommunicating with a nozzle 11, with I-oo 5o Any jar of this kind isliable to crack the which the pipes 7 also communicate, as

mold, particularly at the joints of the fiasks, shown clearly in Figs.III and IV. The upper ends of the pipes 10 are open, as shown at l2,Fig. IV, for the introduction of air.

.13 represents steam or compressed-air pipes provided with valves 14,and which dlscharge into the pipes l0. The nozzles 11 are preferablyprovided with a dividing-diaphragm 15, which keeps the air and steamfrom commingling with the gas until the discharge end of the nozzle isreached. The discharge end of the nozzle has, preferably, an elongatedopening 1G, through which the mingled gas, air, and steam escapes into aflue or duct 17, which discharges into the lower part of the pit l, asshown in Fig. I. It will be understood that there is a iiue or duct 17for each nozzle 11, and that there is anozzle for each set of pipes 7and 10, as shown by dotted lines in Fig. I. The upper ends of the ductsor ilues 17 may be closed, except when the drying is going on, by meansof plugs 1S, for the purpose of excluding sand and dirt.

By covering the pit and flasks and using a fuel of the kind described Iam enabled to dry the flasks in position at a very small expense, andwhen it would be practically impossible to do it if the hood did notinclose flasks, and it would be very difficult to do it b y the use ofother fuels requiring combustion-chambers, ash-pits, draft-fiues, andthe like, and moreover I accomplish aforced upward draft of the heatthrough the pit, which results in carrying the dampness upward and awayfrom the flasks, it being understood that while the pit is inclosed bythe hood 5, so as to retain the greater proportion of heat and cause itto pass evenly through and around the flasks, yet there is sufcientspace between the sections of thehood to permit of the'necessary upwardcirculation of the heat. The point of ignition of the gas and air is atthe exit end of the ducts or ilues 17. With an arrangement of this kindthe flasks are dried without moving them from their supports, whichresults in a very great saving of labor and expense, as already stated.

I claim as my invention- 1. The improved apparatus for drying molds,consisting of a covered pit inclosing the flasks, gas, air, and steam orcompressedair pipes, and ilues or ducts into which the pipes discharge,whereby a free circulation of heat from the ilues through and aroundsaid flasks from bottom to top of the pit is permitted, substantially asset forth.

2. The improved apparatus for drying molds, consisting of a casting-pitinclosing the fiasks, pipes for conducting heat to the bottom of saidcasting-pit, and a covering for said pit above the top of said flasks,whereby a free circulation of heat through and around said flasks frombottom to top of the pit is permitted, substantially as set forth.

3. The combination of a pit for containing the flasks, gas, air, andsteam or compressedair pipes, a nozzle with which said pipes communicateand which is provided with a partition, a flue or duct communicatingfreely with the entire open space of the pit and into which flue or duetthe pipes discharge, and a hood coveringthe pit, substantially as andfor the purpose set forth.

PETER MCARTIIUR.

In presence of- Giro. H. KNIGHT, E. S. KNIGHT.

